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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34acfdc47ba8b69a4df0e588741a453ba2807889811d5d97b8d005b741493f63' 
  AND token = 'zimSdA04RBRStONuk/IIF+34RMJP6Q3w3tUcTPwWmtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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