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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718d8818ced4e5108fa5abb946034ca54a4156a9f61259cecf676207e162d5b5' 
  AND token = '5BZRxk/Z0eluu+SciO/He8VQOJM61zXcy3LGgJ9Nz8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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