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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc219e181dab35d97bec175df6bea8be9636e4f335b011090cb2be4040a6ab0' 
  AND token = 'XR9xbauZ6FbgbrThTZ4GMnn+Mo2qUSy+ow6NmId9pgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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