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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6b4239967fb2fd011ac2200269e7cce05c581ef056f4d2eadff9e933562ae9' 
  AND token = 'tOP1NMCrZBJ+1sxzs+H+RhJ/3qS8JBOf0VHq6Ioutxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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