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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a419ff457ad00583ab14bdbce46a56509850a3f8ffdad4887757aa9affd420c3' 
  AND token = 's4jef0TqR9KiMPciyDaBGMg3nILzKiPTkgOr5g9AJPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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