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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24d34ba9ce163f07124d4a5538d7dfac5ea1c64b5bf3a16c9836e8ab5ddc804c' 
  AND token = 'Zv1m08yfG9yVv9SuEYS16zOKrb+ljxdM5nkqSCXH2Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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