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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050d998793c72c26b01b3ca4ebed2dcd4cca1ea29ae917c14af8b5e6472b3aed' 
  AND token = 'qSHMtA+W050L4G9yHcQ8/GyTDCXvEI58Qugh+hEOY+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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