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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df94a5d199fc6c99a2fdfff2f955473607974fc9db5b851f5753d123d9094bfb' 
  AND token = 'xCcPQdhecUECIm4g7+hdhkHjaGQRWpCEDn9+nCHyXXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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