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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5bf3180a34a93d1b37c522b88e4a68adb110d11ad31e1e2b6d9f86af9044c7' 
  AND token = '2npSTmALVc/pCM0Q8Ga2Yh3fsASVQNHF4dWS1J4yeio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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