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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e0d06c4a9cee3af9c16eda4de7f4e7a0a86efbd1d08d7fb36284a2a6206002e' 
  AND token = 'hvs6ooktybogLRqRyyynqhhkuT45KMRc1rDs2LRfGWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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