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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb4c1f38e14a944e99ddbff219fc663d5c932aeb995ed0902852cbe482f5dbf' 
  AND token = '3yTHJqKOBqVpCKBHdiYUKMtLr/zWTUnOc7olWYcdeJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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