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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7e4b54e12bd0aece0836b0a501b6176ee34f5b5187ed7f4cd8d15e72cb9877' 
  AND token = 'kYX4bnoEyAcDM0jmf7Kd1Egzm1w+Fb3Ax0OUn0by06Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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