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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd12fbdb5f9e5fee6d319aedcafa88c1322a70483b499ed5d30bc8dace516fd' 
  AND token = 'srCsmsiU3CzqDWd1KfJcHENgCpQ06zPbkz5ISLvurAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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