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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c68f0f975ebf7f42bcd51329e2e42653a50dd53ffb7c5d33a079a4f8b2f3b6d' 
  AND token = 'j4vFtfm35v9aScEP43gX6tNksCp2uCbSwPEKNBKFFeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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