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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f229dffd8b082ad52c36aaaa26d5ff958ca5e1b85a6ac9ae697350aac1fafec' 
  AND token = 'kk+TYVuWNsRkI4ASs/3m8w69wh2HUoyb/hiZTaeBgeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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