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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5426d9607d28054a92c8498d1e5339ca55e60821023c5b3c02b76adaf49966' 
  AND token = 'Brrk5LZcCK/2MbgelU0oW/cTtHPzeBYY6O2AU6IHKLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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