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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c68401612acb019aaf75d9547df95749c24f910d98fe107c560fd3f7f1f2de8' 
  AND token = 'kM2cvC1PHM40tGZC/JWOUpNgnqFz/F8OTmJ45geSdko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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