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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cf8d1233ac5c87d732d9d22c248b3ffd91bad6c4eddd08ec2605f8b391873e' 
  AND token = 's4GEnPS+MHigq0cv7QydLORFxxsWaUe3qSweCaHFsWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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