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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a65474a3edc56169e5a3b0c28c1348bb43133349a5508a1db6be7cd13ca5f7c3' 
  AND token = 'AY5GZToRZAJlwSV49mikUuULc9M639sAsaGdUcooGsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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