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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7138794ce56c0abbc1475f48d7f84f812ee90f3c3c5a5a0333cf80fa7a46c2' 
  AND token = '/9Jh/Yi6DMcuHZMmsNXIFUBSo266Yt8QLicyckGqh0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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