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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0d74a368f4bd4adbc05f549439931b30a11f795ebb67fb92671cf33d5ef455c' 
  AND token = 'ryh8TAtypbpIv4EnPDNiOfErmWBnqLrM/lk3Xlx3RZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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