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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb23e780ba38b7fb417c2b418593ea8015d5ee6307526da61d76542dc7042ed' 
  AND token = 'tJMGFGxKh4aiixTj7mWRIi3IN4GUBwI9oct9qvjM0+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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