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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b8397f5403b2bdfa93d677ce8a9cd68882d25150fa7acccf243a2afe6c41b3' 
  AND token = '6pi7Bq3BoFsmmsg2pf2qTAa/0sW69Y8qbtv7SdSUuFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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