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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7099abaf21b0e21bf23070d1aeccaffff8bf9beb2108cd2ff0a6fa2cf627efc' 
  AND token = '+AYUy+0cG+ckOiek5W3d0KAqJvo6MHbIiRr0xcIfHUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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