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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e55c01f73d776c645223a49b850e0e6928db16b1ede6e64215ba1c6aed5a2ac' 
  AND token = '6e/pjMHsGWrk+1NDaKvpWAsOlwqm4QESzpura1jYzWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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