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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b954ede6584a5b38712a666ac14c18f3d24ae78914130c4e66fe10ed3c03573' 
  AND token = 'X8KEs+mW2XI66LwkNwwZb8noJj68k8JjTiJitK20WRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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