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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bf0fbb5561c594be0a354d459888e77120cf86f27b0a20c28693932e4a46e1' 
  AND token = '8xVBaRUcp5CSL4blmkhKaG2SDbK669bHHoJCb8K3Gdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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