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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4817e70dbc20521e2c91cba896683b6962bc80dd522f0cf3020556eed9dfe73b' 
  AND token = '/b8g+X+EVzcOTvTFa3Cr8thFa35A/KOSJkjTFSn+1x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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