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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f908303649f9cebcb3ceae2c8387edaf0ce22a993c926fc8d83383bacfe57d7b' 
  AND token = '0n8lpAo49uu9yRbUp52jPLrJW+mMVhSdbj6LeQ4+CR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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