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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c01fc2568025ef8e85c8ad71bce18a385acf7b10af24a27c93ffacd5a4d07a' 
  AND token = 'b/a2qkwP0sVBOKm+69Srg9OGSNjZ1Nnj0ugu2Mz4pJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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