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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2306911e268ee0b4ea5707cb9ddd77537d6d5c10f0c16a07e8a9f42da774f1f' 
  AND token = 'Xj/JYyVrr4B5GBcUvAYyymXAd8GqSNHbnI+s1lsVGD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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