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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b97884e8089edac125d6d7774f5817e91be75487994b3f4286133616fb8c03' 
  AND token = 'lApdcw2+JJSxwyW6eY3vSq5U6s3G3qEihGkD69wn8yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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