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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fba89ac0fa044502ef41bfd876d81e3aff6987951a4dcb5a11632034338066' 
  AND token = 'sWWZjD4rZ5HT3TF+vLaBS8xhtT7DyfxxgudRmFzWpcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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