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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e18581703da3858001e7b850169e6128e86ef409538eb521fdc2afb85bc3ccc' 
  AND token = 'Z0/CLAtugezU+aaJNSAwP34Q75ojrUac7R4pb//ac6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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