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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b368b370967be0fc6fb74611d6fc8f29990a02d0c433f284940aef820602b57b' 
  AND token = 'vMUQm8rxmMyPYMo3m+WeDqQGOxf5rE2Z/ivXbrNrrDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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