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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61695154c6a1dd944f71469f2ef5b3d3b9803455a1579a6b9c24efa1779591d2' 
  AND token = 'hRpsX65+tlumE7SJ7aiGHTKz1LD3yf91ZK+L6iAixmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}