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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c4520bc888753766c9635a53aeb0dacc3a52b6cfd82ae7593f96b07dbeab981' 
  AND token = 'XOc9qeMOfGi7WaBFCXa1y4JrJUIarkEbl8Tzi7W4D2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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