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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb20a901b44d60ccaafa6ae1ee792a2ea6799340382442cce39b6c4a3789a7d' 
  AND token = 'qRE66H1jv6XMln9vhsrpuFx8Krm5G5Zak1yZxSTSru4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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