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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8061ae630de03ca3addf931116807c0529cd5c099d213344a926624755af8fe7' 
  AND token = '3pNx5Uwz8svHvXbWB8fDYZUEgTEcz+am9EsneMrp8PM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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