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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0094049fe90fbd41ffbcd96c661d8fe56cfc8b429cc55601de0e079bac7bf9f9' 
  AND token = 'uTv1jhtYuH8P6E5AsBufjdSw5Byp+4ocE2PV0heeK80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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