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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3304a953de75e62394b6a4e5a1b4c94b8bef7781da86da6d31940bfbc6432dc6' 
  AND token = '5SN6JzQHTTOQAwevp3st4zQWwqLwITBQ+TrMIWgZzkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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