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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fc23f0e59d924d114d61e9ad0a81181500b35824c117464f134c9a1edd25da' 
  AND token = 'jMP1kypPTjRijXw4Cjt2o/WenIF1cleuhFcm/1bMnuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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