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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a7461cf45a811940114708b2809224e85d9d933136cbb052af8ff7f19654b3' 
  AND token = 'C9kzjytlN222d+Vp2XakIyuhxyg2+xfF4VA1+E/mLaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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