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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433fdc2df5af0f3f41cbed059a731846bfb3a1c03c12bd41e7a077318ff33561' 
  AND token = '0Eot5iuMQLll2cC4l0He6N/h2dSzeKXzJJAW4ijQEDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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