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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323f89c913fc72fb14a851210abec6ce6b10762685ddc91726cd65a4f32ab88d' 
  AND token = '/m8V1GoGe1wg5DQx9MQCO79hC4jfjqb1oRZjXaxyM00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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