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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ded3a7e9e37f5ede2f6234853097f0916c384904974025efd4456c721602bc7' 
  AND token = 'Zh4VQply/FviCdrsN0opakZr0sViUXlT+aKqf4iKVF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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