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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e6b6c581780c28915a86372fe20ac4b5f206b1a6cf4ac0163f3f4ca234a8ce' 
  AND token = 'CAKRRKu880+1S8UZbtABN4PAOyEkh3pWNTlHugegaok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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