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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137c33523a100f93080bcf60286154a1e86fb930a42261592793b8112b6e152a' 
  AND token = 'dlyzY8EUjFf9anQf1IC4NfdNyboDq7/z+/pt/Zr0sGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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