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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e38d76c3ed7b14bf61386573bf6f233ba191e4ee647ad0e329467aac519456e' 
  AND token = 'S+ZDg/z83ufRnrQADsN3CyiooAYUqRsu5diZLnGo9Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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