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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fb3f2b0cf918b943f5a2f96ad5cccdd27bbf285fa57eef8939a4ccb08be9a5f' 
  AND token = '2XAbN/UvwEKMtcczzjiZLaQeHju+TGLpKHbjsFvfFsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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