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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0168630ae8c32fc06564ba6496528ca8752557d0add19d6273a6b9348c984f45' 
  AND token = 'mLlebAm/Quyfw910ZK1U71ECIocSkGBBL+klDnex/M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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