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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a267f8c7146a823aa5dd15ac9c337bee991dce5a946386e5d3d64ab0225fa62c' 
  AND token = 'nwS3sgRbKGpKNreE3YloYEnyFyJxvJIRZrfZldkwbQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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