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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183c353c70e2e8c6c8bd2424f0d313b36e43c4e571e3659d4974330a58ba0d4c' 
  AND token = 'z9D3/PwnYTYIt1IWm4TG807aehSYiTI042veA3fpD/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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