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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f6c21e9ae8dfbcf0e02c0d012334470e39c8447ffa94ed5b5f841f8dbce7cf' 
  AND token = 'fOXGlbcpRpdSUI8+mmMr8/9Q+WKAn/3f1boB9bEdE+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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