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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbaefa6f7ed404d00373450ad9612c398ee4c173d86526247705c806deee7ad5' 
  AND token = 'x5k2FzDFDYUQ7d7L2Si/lr7u1EnSRuJntLjyRSVCl6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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